Mrak - cloud

It is given segment AB of length 12 cm, where one side of the square MRAK laid on it. MRAK's side length 2 cm shown. MRAK gradually flips along the line segment AB the point R leaves a paper trail.
Draw the whole track of point R until square can do the line AB on both sides and returns to its original position.

Correct result:

n =  0



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